Thanx. Thast appears to have solved the Cubase part of the audio problems (the instruments remain dead).
It’s not as obvious as people try to make it. I agree with GlennO’s posting.
Also, this is the first time I’ve come across this issue in 20 years, with numerous audio interfaces!
It would be interesting to know what microphone I gave Cubase acesss to. The Mac Pro doesn’t have an inbuilt microphone!